Wednesday, April 13, 2016

Re: [Avid-L2] 3D Hard LUT vs. Soft LUT What The LUT?

 

That's a great link.  It raises all kinds of questions as to what would best resemble the performance of the Arri LogC to Rec 709 I'm use to applying in Resolve.  I use the 3D LUT in Resolve and it gives me a nice starting point when baking out Avid DNX.

As I google around there are suggestions that 1D LUTs are better if not changing color space.  I had always used the 3D LUT because I thought it was more accurate but honestly I'm not aware of all the subtle differences.  I had never thought about what color space the Arri was shooting but I assumed LogC was a different color space than Rec 709 but now I'm wondering.  I just want to undo the LogC back to Rec 709 so is that better with a 1D or a 3D LUT.

Either I am making this more difficult than it is or it is more complicated than meets the eye.  I just want to un LogC the footage like I do in Resolve when I use Resolve's Arri LogC to Rec 709 Output LUT.  That isn't hard in Resolve but I have never had to start making tweaks for it to have satisfactory results.



---In avid-l2@yahoogroups.com, <bogdan_grigorescu@...> wrote :

why not use ARRI's own LUT generator?

BG
www.finale.tv



From: "John Moore bigfish@... [Avid-L2]" <Avid-L2@yahoogroups.com>
To: yahoogroups <avid-l2@yahoogroups.com>
Sent: Wednesday, April 13, 2016 7:25 PM
Subject: [Avid-L2] 3D Hard LUT vs. Soft LUT What The LUT?

 
Attempting to bring the Arri LogC to Rec 709 LUT from Resolve into Avid I found Avid would not import the .dat file in the Resolve LUT folder.  I went to the look up table setting page in Resolve and generated a LUT based on the Arri LogC to Rec 709.  This created a .cube LUT that Avid would import.  The automatically generated name said "soft" in the title.  I had not check the scale to levels box which I"ve read leads to a hard clip at the upper and lower values which 940 and 64 for 10 bit.  I didn't know to address these settings when generating the LUT.  If I left the settings at 0% softness on the upper and lower clips isn't that in essence a hard clip.  Things seem to be looking good but this was on a system without a scope so I don't have a real way to check things.

Is there a way in Resolve to generate a LUT based on it's internal Arri LogC to Rec 709 that isn't soft?
 
John Moore Barking Trout Productions Studio City, CA bigfish@...


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Posted by: bigfish@pacbell.net
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this is the Avid-L2

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